The Beast who conquered Undertaker's 21-year WrestleMania streak, Brock Lesnar, promises to inflict "the beating of a lifetime" on John Cena, but it will take more than that to pry the gold from a man whose every heartbeat drives him to be The Champ. Plus, Stephanie McMahon competes in her first sanctioned match in over a decade when she takes on the Diva whose life she tried to tear apart, Brie Bella. One of WWE's most combustible rivalries explodes when Roman Reigns faces Randy Orton. There's no escape for Seth Rollins when his maniacal former ally, Dean Ambrose, finally gets his hands on him in a Lumberjack Match. All this and more as WWE presents the 27th annual SummerSlam!